| Date | IP Address |
| 2018-12-19 | 52.51.32.62 (ClassC) |
| 2022-04-26 | 99.84.111.7 (ClassC) |
| 2022-09-17 | 18.160.46.107 (ClassC) |
| 2023-08-26 | 108.139.1.17 (ClassC) |
| 2024-06-07 | 172.64.146.208 (ClassC) |
| 2024-07-10 | 104.18.41.48 (ClassC) |
| 2024-07-28 | 104.18.27.195 (ClassC) |
| 2025-01-08 | 172.64.152.115 (ClassC) |
| 2025-07-31 | 104.18.35.141 (ClassC) |
| Date | Domain | IP |
| mail.pfizer.ie | 2025-05-11 | 52.51.32.62 |
| www.pfizer.ie | 2025-01-04 | 172.64.152.115 |